function g = sigmoid(z)
%SIGMOID Compute sigmoid functoon
%   J = SIGMOID(z) computes the sigmoid of z.

% You need to return the following variables correctly 
g = zeros(size(z));

% ====================== YOUR CODE HERE ======================
% Instructions: Compute the sigmoid of each value of z (z can be a matrix,
%               vector or scalar).

for i = 1:size(z,1)
  for j = 1:size(z,2)
    g(i,j) = 1/(1+e^-z(i,j));
  endfor
endfor

% =============================================================

end
